git-squash.sh

#!/bin/bash

# Auto squash commits down into one prior commit
# Usage:
# ./git-squash.sh n
# where n is the total number of commits to squash (excluding the commit to remain)

squashCount=$1

echo "Squash the following commits:"
git log --no-decorate --format=oneline --max-count=$squashCount
echo "into:"
git log --no-decorate --format=oneline --max-count=1 --skip=$squashCount

read -n1 -s -r -p $'Press any key to continue or [Crtl-c] to exit\n'

stash_output=$(git stash)
git reset --soft HEAD~$squashCount
git commit --all --amend --no-edit
[[ "$stash_output" != "No local changes to save" ]] && git stash pop